Redact digest.hmac_sha256 signing secrets, req.http.X-Purge-Token headers, acl purge/ban internal VPC subnets, and backend .host origin IPs while keeping VCL 4.1 subroutine AST and regsub regexes 100% valid.
varnishd -C Validated & Sanitized VCL Output (70% Instant Preview)
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sed -E 's/(X-(Purge|Ban)-Token"?[[:space:]]*==[[:space:]]*")[^"]+/\1REDACTED_PURGE_TOKEN/gi; s/(hmac_sha256\(")[^"]+/\1REDACTED_HMAC_KEY/g' /etc/varnish/default.vcl⚠️ Why Naive CLI / Regex Fails: Naive sed string replacement corrupts escaped quotes inside VCL regsub() and ban() regex expressions, misses multi-line acl purge { ... } CIDR blocks and backend .host origin IPs, and fails on inline C{...}C blocks—causing varnishd -C syntax compilation to fail.
🛡️ Pre-LLM & Ticket Safety: How to sanitize a Varnish default.vcl configuration or varnishlog output before pasting into Claude, ChatGPT, or Cursor
Engineered for SREs, platform engineers, and CDN architects debugging Varnish vcl_recv, vcl_backend_fetch, and ban lurker rules without exposing origin IPs or cache-purge tokens.
Execute all VarnishVclShield operations 100% locally inside client browser memory with zero cloud uploads.
Bypass server queue latency and network roundtrips with lightweight client-side in-memory varnish vcl engine.
Guarantees zero varnish vcl data uploads or third-party tracking headers touch external network servers.
Pay a single flat $19 buyout fee for unlimited varnish vcl processing and lifetime commercial rights.
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Select your local input file or test sample data inside browser memory.
Adjust varnish vcl parameters and strictness in real-time.
Client-side algorithms process and sanitize varnish vcl payload 100% on your device.
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| Feature / Metric | 🛡️ VarnishVclShield | ☁️ Cloud SaaS (Fastly) |
|---|---|---|
| VCL Data Sovereignty & Origin Privacy 🔒 | 🛡️ 100% Local Browser RAM (Zero Network Egress) | ☁️ Requires Cloud Control Plane Upload |
| Purge/Ban Token & VMOD HMAC Scrubbing 🔐 | 🛡️ Auto-Scrubs X-Purge-Token & digest.hmac_sha256() | ☁️ Leaves Shared Secrets in Exported VCL Revisions |
| Origin Backend IP & ACL CIDR Shielding 🌐 | 🛡️ Maps backend .host & acl Blocks to RFC 5737 IPs | ☁️ Exposes Unshielded Origin Server IPs |
| VCL 4.1 regsub() & ban() AST Integrity ⚙️ | 🛡️ Preserves varnishd -C Compilable Subroutine Syntax | ☁️ Manual Regex Edits Break Escaped VCL Quotes |
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Ensures zero VarnishVclShield bytes touch external API servers or third-party storage.
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Varnish Configuration Language (VCL 4.0/4.1) embeds regular expressions inside double-quoted strings in regsub(), regsuball(), and ban() calls, alongside multi-line acl and backend blocks. A naive sed quote replacement corrupts string boundaries and causes varnishd -C compilation to fail. VarnishVclShield targets only secret literals, ACL CIDRs, and backend .host strings in browser RAM.
Exposing backend .host origin IPs lets attackers bypass your Varnish or Fastly edge layer and DDoS your origin servers directly, while leaking req.http.X-Purge-Token or acl purge CIDRs allows unauthorized cache invalidation floods and HMAC signature forgery.
Paste your default.vcl or Fastly custom VCL snippet into VarnishVclShield. Within 50ms in local browser RAM, all backend .host IPs and acl purge CIDRs are mapped to RFC 5737 documentation addresses while X-Purge-Token headers and digest.hmac_sha256() secrets are masked.
Never. VarnishVclShield executes 100% inside your browser's local RAM with zero network egress. Your origin server IPs, internal VPC CIDR ranges, and HMAC signing keys never leave your machine.
Enterprise CDN suites cost $49/mo+ ($588/yr) and require cloud account sync, while generic CyberChef regex recipes lack VCL 4.1 grammar awareness for acl blocks, backend definitions, and VMOD digest calls. VarnishVclShield is purpose-built for VCL at a $19 one-time buyout or €3.99 24h pass.
Unlocking PRO removes the 30% preview blur on bottom VCL subroutines, enables multi-file VCL include batch scrubbing (default.vcl + backends.vcl + acl.vcl), and downloads a self-contained air-gapped HTML workstation with a 14-day refund guarantee.